PSA Oxygen Plants

We are manufacturers and EXPORTER of oxygen/NITROGEN gas plant in India. Our PSA Oxygen Plants are being manufactured as per the latest technology & design of the Company ING. L. & A., BOSCHI, ITALY since 1930. This technology has been proven all over the world for its working efficiency & trouble free operation.

Detailed Manufacturing Process

Step 1:
Air Compressor
The free saturated air is sucked from
atmosphere through a highly efficient
dry-type suction filter into the first stage
of the horizontally balanced opposed,
lubricated reciprocating air compressor.

Step 2:
Purification of Air (Process Skid)
This consists of purification of the air by
removing moisture, oil traces and carbondioxide
in the process air. Compressed air is hilled to 12 °C in a hilling
unit and evaporation cooler, compressed air
passes through the oils of the hilling unit at a
temperature of 12 °C to a moisture separator,
where the condensed moisture gets
removed
before entering into
Molecular Sieve Battery.
Before sending the air to MOLECULAR
SIEVE BATTERY, air is passed through an
OIL ABSORBER
where air becomes oil free.
Chilled air passes through the Molecular
Sieve Battery consisting of Twin Tower
packed with molecular sieves to remove
moisture and carbon dioxide present in the
air.

Molecular Sieve Battery operates on Twin Tower System, when one tower is
under production the other tower is regenerated by passing waste nitrogen gas
at 200 °C through a REACTIVATION HEATER .After interval of 8 to 10 hours,
the tower under production gets exhausted and regenerated by similar process
before use and, thus the cycle continues. Any dust particle gets filtered in the
DUST FI TER before air enters the AIR SEPARATION COLUMN All the
equipments are mounted on process skid.(See our Catalog)

Step 3:
Expander (Expansion Engine)
The process air before liquefication in the air separation
unit needs to be cooled to temperatures sub-zero
(cryogenic). The main portion of the air after the process
skid enters the expansion engine through the heat
exchanger no.1 after pre-cooling. The temperature of the
air drops to around
-165degC by the Expander which is
a very highly efficient advanced design with Teflon
piston rings and completely hydraulic mechanism with
leakproof ball valves.

Rest of air at (-80) degC from Heat Exchanger No.1 enters
into a highly efficient EXPANSION ENGINE, where the air
further gets cooled down to (-150)deg C before entering
into bottom column. The liquefied air from both these
streams collected at the BOTTOM COLUMN is known as RICH
LIQUID

Step 4:
Air Separation Unit

After the process skid, the air enters the air separation
unit (cold box)where the air converts into liquid air by
deep cooling at cryogenic (low temperatures)and is
separated into liquid oxygen and nitrogen.

Chilled, Oil-free and moisture-free air enters into multi-pass HEAT
EXCHANGER No.1 where it gets cooled to (-80)degC by cold
gained from outgoing waste nitrogen and oxygen. A part of air,
this enters a multi-pass HEAT EXCHANGER NO.II or LIQUEFIER
made of special alloy tubes. This air cools to (-170)degC before
passing through an expansion valve. Due to
Joule Thompson Effect
after the expansion valve, air gets further cooled down and gets
liquefied before entering into Bottom Column .

The RICH LIQUID in the BOTTOM COLUMN enters into
feed tray of top column. Similarly the liquid nitrogen called
POOR LIQUID enters into top column as a reflux &it takes away the latent heat
of condensing oxygen and gets vaporized whereas the liquid oxygen flows down
the trays of the TOP COLUMN into the condenser. Liquid Oxygen from
CONDENSER passes through a SUB-COOLER to a LIQUID OXYGEN PUMP.